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Full text of "Monthly performance report : Bond Construction"

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SOLAR/1050-79/02 

Monthly 

Performance 

Report 



BOND CONSTRUCTION 
FEBRUARY 1979 




U.S. Department of Energy 




National Solar Heating and 
Cooling Demonstration Program 

National Solar Data Program 



NOTICE 

This report was prepared as an account of work sponsored by the United States 
Government. Neither the United States nor the United States Department of Energy, nor 
any of their employees, nor any of their contractors, subcontractors, or their employees, 
make any warranty, express or implied, or assume any legal liability or responsibility for 
the accuracy, completeness or usefulness of any information, apparatus, product or 
process disclosed, or represents that its use would not infringe privately owned rights. 



MONTHLY PERFORMANCE REPORT 

BOND CONSTRUCTION 

FEBRUARY 1979 

I. SYSTEM DESCRIPTION 

The Bond Construction site is a single-family residence in Gladstone, Missouri. 
The home has approximately 1400 square feet of conditioned space. Solar 
energy is used for space heating the home and preheating domestic hot water 
(DHW). The solar energy system has an array of flat-plate collectors with a 
gross area of 465 square feet. The array faces south at an angle of 37 
degrees to the horizontal. A propylene glycol solution is the transfer 
medium that delivers solar energy from the collector array to an external 
heat exchanger. Water is the transfer medium that delivers solar energy from 
the external heat exchanger to storage and from storage to the hot water load 
and liquid-to-air heat exchanger in the furnace. Air is the transfer medium 
that delivers solar energy to the space heating load. Solar energy is stored 
in the basement in an 800-gallon steel storage tank with walls approximately 
1/4-inch thick. The storage tank has 4-inch polyurethane insulation on the 
bottom and 8-inch fiberglass insulation on the top and sides. Preheated city 
water is stored in an 82-gallon DHW tank. When solar energy is insufficient 
to satisfy the space heating load, a gas furnace provides auxiliary energy 
for space heating. Similarly, an electrical immersion heater in the DHW tank 
provides auxiliary energy for heating the supply water. Solar energy is 
transferred from the storage tank to the hot-air heating system by a liquid- 
to-air heat exchanger contained in the furnace ductwork; solar energy is 
transferred from the storage tank to the DHW tank by an annular heat exchanger 
jacket around the hot water tank. The house also contains a fireplace with 
an integral fan; the fireplace is only instrumented for monitoring fan power 
consumption. The system, shown schematically in Figure 1, has 5 modes of 
solar operation. 

Mode 1 - Col lector-to-Storage : This mode activates when there is a tempera- 
ture difference of 20°F between a control sensor located at the collector and 
a control sensor located inside the storage tank (near the bottom). At 
this time the controller turns on both the collector and storage circuit 
pumps (PI and P2, respectively). Solar energy is transferred from the collector 
to the storage tank by an external heat exchanger. Both pumps continue to 
operate until the temperature difference is less than 5°F; the controller 
then turns both pumps off. 

Mode 2 - Storage- to-Space Heating : This mode activates when the room tem- 
perature drops to the setting on the house thermostat. At this point, this 
mode is initiated if the storage temperature, measured by a control sensor 
inside the tank (near the top), is higher than 95°F. If so, the furnace 
circuit pump (P3) turns on and hot water circulates from the storage tank 
through a liquid-to-air heat exchanger in the furnace. At the same time the 
furnace fan turns on, forcing air past the heat exchanger, thereby transferring 
the solar energy to the heating load. If the room temperature drops an 
additional increment (set point), the auxiliary gas burner turns on to provide 



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auxiliary energy to the heating load. If storage temperature falls to 90°F 
while in this mode, the mode terminates. However, the fan and gas furnace 
continue to supply energy until the thermostat demand is satisfied. If the 
storage temperature is below 95°F when the room thermostat calls for heat, 
this mode does not activate; auxiliary energy is then provided by the gas 
furnace. The pump, fan and burner (if on) are turned off when the room 
temperature exceeds the thermostat setting. 

Mode 3 - Storage- to-DHW : This mode activates when there is a temperature 
difference of 10°F between the control sensor located inside the storage tank 
(near the top) and the control sensor located in the hot water tank (near the 
middle). This mode terminates when the temperature difference drops to 3°F. 
When this mode activates, pump P4 circulates hot water from the storage tank 
through an annular jacket surrounding the hot water tank; energy is thereby 
transferred to the water in the hot water tank. The electric immersion 
heater in the hot water tank turns on to provide auxiliary energy to the DHW 
if the temperature in the hot water tank drops below its thermostat setting. 

Mode 4 - Elimination of Excess Heat in Summer : This mode activates when the 
storage tank temperature, as determined by an aquastat located in the tank, 
exceeds 180°F. At this time the collector and storage circuit pumps (PI and 
P2, respectively) are activated, thereby transferring energy from the storage 
tank to the collector by way of the external heat exchanger. This energy is 
then radiated from the collector to the atmosphere. This mode continues 
until the storage temperature drops below 180°F. 

Mode 5 - Snow Removal in Winter : This mode activates when the collector and 
storage circuit pumps (PI and P2) are manually switched on in order to melt 
the snow that has accumulated on the collector. 

II. PERFORMANCE EVALUATION 



INTRODUCTION 

The site was unoccupied in February; however, the solar energy system operated 
continuously during the month. Solar energy satisfied 23 percent of the 
space heating requirements. The solar energy system provided fossil fuel 
energy savings of 4.8 million Btu and incurred an electrical energy expense 
of 0.080 million Btu. A control problem caused intermittent cycling of mode 1 
during periods of good insolation; this resulted in mode 1 operation for only 
60 percent of the time that potential mode 1 conditions existed during the 
month. There was no hot water load during February since the water was 
turned off. 



WEATHER CONDITIONS 

During the month, total incident solar energy on the collector array was 19.6 
million Btu for a daily average of 1501 Btu per square foot. This was above 
the estimated average daily solar radiation for this geographical area 
during February of 1279 Btu per square foot for a south-facing plane with a 



tilt of 37 degrees to the horizontal. The average ambient temperature during 
February was 23°F as compared with the long-term average for February of 
32°F. The number of heating degree-days for the month (based on a 65°F 
reference) was 1189, as compared with the long-term average of 916. 

THERMAL PERFORMANCE 

Syste m - During February the solar energy system performed somewhat poorer 
than expected. The expected performance was determined from a modified 
f-chart analysis using measured weather and subsystem loads as inputs. Solar 
energy collected was 4.0 million Btu versus an estimated 7.9 million Btu. 
Solar energy used by the system was estimated by assuming that all energy 
collected would be applied to the load. Actual solar energy used was 2.9 
million Btu. System total solar fraction was 23 percent versus an estimated 
64 percent. The poorer performance is attributed to the on/off cycling of 
mode 1 operation during periods of good insolation. This is discussed further 
in the "Observations" section below. 

C ol lector - The total incident solar radiation on the collector array for the 
month of February was 19.6 million Btu. During the period the collector loop 
was operating, the total insolation amounted to 5.2 million Btu. The total 
collected solar energy for the month of February was 4.0 million Btu, result- 
ing in a collector array efficiency of 20 percent, based on total incident 
insolation. Solar energy delivered from the collector array to storage was 
4.0 million Btu. Operating energy required by the collector loop was 0.080 
mi 1 1 ion Btu. 

Storage - Solar energy delivered to storage was 4.0 million Btu. There were 
2.9 million Btu delivered from storage to the space heating subsystem. 
Energy loss from storage was 1.1 million Btu. This loss represented 28 per- 
cent of the energy delivered to storage. The storage efficiency was 71 
percent: This is calculated as the ratio of the sum of the energy removed 
from storage and the change in stored energy, to the energy delivered to 
storage. The average storage temperature for the month was 98°F. 

Space Heating Load - The space heating subsystem consumed 2.9 million Btu of 
solar energy and 15.8 million Btu of auxiliary fossil fuel energy to satisfy 
a space heating load of 12.4 million Btu. The solar fraction of this load 
was 23 percent. The space heating subsystem consumed a total of 0.67 million 
Btu of operating energy. 

OBSERVATIONS 

During the month, the solar energy system cycled on and off in mode 1 during 
periods of good insolation. As a result of this cycling, approximately 40 
percent of the available solar energy was not collected. During periods of 
good insolation, mode 1 operation averaged 45 minutes, while the quiescent 
periods (between mode 1 operations) averaged 30 minutes. The grantee must 
determine the cause of this cycling in order to increase the amount of energy 
collected and to improve the performance of the solar energy system. 



The temperatures in the collector/heat exchanger (HX) loop were analyzed to 
try to determine the reason that the amount of solar energy delivered to the 
HX (4.1 million Btu) exceeded the energy collected (4.0 million Btu). Before 
a collection cycle (mode 1) begins, the fluid in the collector is heated by 
the sun. When mode 1 begins, this heated "batch" of fluid is delivered to 
the HX. During the start of a collection cycle, the temperature differences 
between the collector output (T101) and HX input ( T103) and between the HX 
output (T102) and collector input (T100) fluctuate considerably. However, 
once a steady-state condition is reached (i.e., after the initially-heated 
"batch" of fluid has been delivered to the HX), the losses in the plumbing 
normally cause a temperature drop from T101 to T103 and also from T102 to 
T100. An analysis of the data received for the month does show a small 
temperature drop between T101 and T103 during steady-state conditions. How- 
ever, an average temperature rise is shown from T102 to T100 (0.9°F). It is 
assumed that this temperature rise is due to an error in one or both temperature 
sensors. The calibration of the temperature sensors in the collector/HX loop 
will be checked to determine whether this is the only cause of the solar 
energy gain from the collector to the HX. Further analysis shows that an 
error of 1°F in T100 (reading too high) will result in the collected solar 
energy exceeding the energy delivered to the HX by 0.13 million Btu. 

Anomalies in two of the three storage temperature sensors required that the 
storage temperature be based on the single operating sensor. Since this 
sensor measures the temperature at the top of the tank, the reported average 
storage temperature (98°F) is probably higher than the true average storage 
temperature. 

An anomaly caused W401 (furnace air flow) to read zero for the entire month. 
Therefore, the auxiliary thermal energy supplied to the space heating load for 
February was derived from the auxiliary fossil fuel used during the month 
rather than from the mass flow and temperature differences in the space heat- 
ing subsystem. 

ENERGY SAVINGS 

The solar energy system provided a total fossil fuel energy savings of 4.8 
million Btu and incurred an electrical energy expense of 0.080 million Btu. 



III. ACTION STATUS 

The grantee must resolve the cause of the cyclic operation of mode 1 during 
good insolation conditions. Boeing must resolve the sensor anomalies and IBM 
must recalibrate the collector/HX loop sensors on their next site visits. No 
site visits are currently scheduled at this time. 



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